Figure 4. IR spectrum of aspartame in a KBr-tablet using transmission cell IR spectroscopy showing absorption by the acid moiety (2500-3600 cm-1), the secondary amine (3323.64 cm^-1), the aromatic ring (3029.88 cm^-1 and 3063.14cm^-1), the aliphatic chain (2950.19 cm^-1) and carbonyl absorptions (1665.90 cm^-1 and 1736.95 cm^-1)

From

A Complete Structure Investigation of an Organic Molecule for Chemistry Students; An Analysis of Aspartame

Marit Kristin Leiren, Kari Grete Nordli Børve, Rhiannon Tveiten Lewis, Signe Steinkopf

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